ANATOMY

Detailed explanation-1: -The correct answer is c. chloride. Chloride is the most abundant anion in the extracellular fluid and serves a central role in regulating osmotic pressure as well as the membrane potential. There are many transport proteins that allow chloride ions in and out of the cell to regulate these factors.

Detailed explanation-2: -Within the extracellular fluid, the major cation is sodium and the major anion is chloride.

Detailed explanation-3: -Intracellular and extracellular fluid of neurons contain various kinds of charged ions. These include sodium (Na+), potassium (K+), and chloride (Cl-). Additionally, these fluids contain many negatively charged protein molecules called anions (A-).

Detailed explanation-4: -The majority of anions are chloride Cl− ions, followed by bicarbonate HCO3− ions, then phosphate PO43-ions, then sulfate SO42-ions, and finally some organic acids and negatively charged plasma proteins, like albumin.

Detailed explanation-5: -Answer and Explanation: Chloride is the most abundant anion in the extracellular fluid (ECF).